“I think I prefer it out here,” said Nicole Kidman in the freezing cold outside CAA’s jam-packed Sundance party, where wild performers from SimonHammerstein’s Las Vegas club the Act were suspended in the air but still grinding away in skimpy underwear. Kidman’s agent, Chris Andrews, dashed outside to walk the star to a waiting car. Kidman sped off, and Andrews tried to get back into his own party and had to haggle with a security guard to be readmitted. The Act performers included a woman in lingerie atop a costumed man in a saddle who licked and bit guests. (Not everyone was thrilled: “I was wondering the same thing,” tweeted Sundance Institute executive director Keri Putnam when a showbiz blogger tweeted, “Pole dancing at the caa party at #sundance. Why?”) Fully clothed Alexander Skarsgard, the “True Blood” hunk, got almost as much attention as the performers. Kidman stopped by a Fox Searchlight bash celebrating her movie “Stoker” at the Grey Goose Blue Door Lounge and removed her white pumps for pictures with shorter co-star Mia Wasikowska. Hollywood agencies CAA, WME and UTA held their parties on the same night doors from each other, sending execs scrambling from bash to bash. Even VIPs were kept waiting in the cold, including Michael C. Hall. WME transformed restaurant Wahso into a plush club with a packed dance floor circled by intimate booths. Spotted were Jason Reitman, Rooney Mara, Toni Collette, Wasikowska, Casey Affleck, Felicity Jones and WME’s AdamVenit.